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廢水中氨氮沉淀的影響因素

Factors Influencing Ammonia Nitrogen Precipitation from Simulated Wastewater

  • 摘要: 以MgCl2和Na2HPO4為沉淀劑,用實驗室模擬廢水研究了影響氨氮沉淀的因素,包括沉淀pH值、沉淀劑的添加量及氨氮的原始質量濃度.結果表明,沉淀pH值是影響氨氮沉淀的主要因素,它影響氨氮的沉淀率、殘余氨氮濃度、Mg2+和PO43-的沉淀率和殘余量以及沉淀后水的pH值.最佳沉淀pH值為11.氨氮的初始質量濃度在1 000 mg/L以下時,隨其降低氨氮的沉淀率和殘余氨氮質量濃度都降低;低于100 mg/L時沉淀率明顯降低,但殘余氨氮質量濃度可以達到5 mg/L,且變化不再明顯.

     

    Abstract: In the laboratory and with a simulated wastewater as samples, the factors influencing the precipitation of ammonia nitrogen from wastewater were investigated with MgCl2 and Na2HPO4 as precipitants. These factors studied include the pH of precipitation, the dosage of precipitants, and the initial NH4+-N concentration of waste-water. The result shows that the pH of precipitation is the key factor and it determines the precipitation rate of NH4+-N, the remaining concentration, the removal rate and the remaining concentration of Mg2+ and PO43-. The optimum pH is 11. When the initial NH4+-N concentration is less than 1 000 mg/L, both the precipitation rate and the residual concentration of NH4+-N decrease with decreasing the initial concentration. When the initial NH4+-N concentration is less than 100 mg/L, the precipitation rate decreases dramatically, but the minimum residual concentration is 5 mg/L and remaining the same.

     

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